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did you try solving it with vectors?

im thinking of midpoints :)

(P+R)/2 = (Q+S)/2
P+R = Q+S

but that just gets me parallel lines that have no solution :/
a+b = -2
a+b = -8

is there a figure to pull information off of?

what did you mean by your last message, amistre64? btw, is there anything wrong with my solution?

ghass1978, nope i don't remember how to use vectors... it's not part of our exam. sorry

your initial ideas look good in that they are defining valid properties

is there a diagram that goes with this? or is it just a wordy problem?

just that, exactly that :( waaaaahhh :(

why get the midpoint?

draw a parallelgram|dw:1345727410942:dw|

|dw:1345727435579:dw||dw:1345727448036:dw|

|dw:1345727657560:dw|

Nice work @amistre64

thnx :)

nevermind, i believe our teacher gave the wrong given. i believe s should have been (a+2, b+5)